Source: Rashean Mathis to Lions

Veteran cornerback Rashean Mathis will sign a one-year deal to remain with the Detroit Lions, a league source told ESPN NFL Insider Adam Schefter on Monday.

Mathis, entering his 12th NFL season, started 13 games for the Lions in 2013 and had 47 tackles. Overall, he saw action in 15 games.

He was picked up midway through training camp and initially was a depth player used for mentoring some of Detroit's younger cornerbacks, however Mathis took over the starting job from Darius Slay in Week 3 and turned into the Lions' top cornerback in 2013.